Abstract: Based on the hypothesis of eliminating spinning draft waves by slight high-frequency waves, the slight high-frequency effect on fibers~{!/~} friction coefficient of staple fiber strands is analyzed theoretically. The linear alternating slight hign-frequence waves not only changes the static state of fibers, and transfer the static-friction to the dynamic-friction (or lead to dynamic-friction dominating), but also generate the high-press gas film which decrease the fiber~{!/~}s contacting area and reduces the fiber~{!/~}s friction coefficient. Further more, by analyzing the force and movement of floating fibers, and introducing the relationship between the fiber~{!/~}s friction coefficient and their relative velocity, the model of fibers~{!/~} friction coefficient under slight high-frequency waves is established, and the fibers~{!/~} effect factors are analyzed as well. It concluded that the fibers~{!/~} friction coefficient are relative with fiber~{!/~}s length, the embed length in other fibers with varied velocity, fiber~{!/~}s section radius, fibers~{!/~} density in the strands, fiber~{!/~}s modul, fibers~{!/~} relative velocity, average fibers ends in section of fiber strands, the frequency and amplitude of slight high-frequency waves. Therefore, it~{!/~}s theoretically proved that fibers~{!/~} friction coefficient of staple fiber strands could be reduced by the slight high-frequency waves.

Key words: fiber&rsquo, s friction coefficient model